Damper-regulating mechanism.



J. M. BEECH.

DAMPER REGULATING MECHANISM.

APPLIGATION FILED FEB. 21.1911. RENEWED JULY 12. 1914.

Patented Feb. 9, 1915.

3 SHEET$-SHEBT 1.

THE NORRIS PETERS co PHOTO-LITHQ, WASHINGION, D r.

J. M. BEECH.

DAMPER REGULATING MECHANISM. APPLICATION-FILED PEB.21,1911. RENEWED JULY 13,1914. 1,17,95%

Patented Feb. 9, 1915.

3 SHEETS-SHEET 2.

THE NORRIS PETERS co Fnulv 1.1mm. WASHINulL/tv. u, c.

J. M. BEECH.

DAMPER REGULATING MECHANISM.

APPLICATION FILED PEB.21.1911. RENEWED JULY 13, 1914.

1,1%7,95%u Patented Feb. 9, 1915.

3 SHEETS-$HEET 3.

H45 NORRIS PETFRS CO PHoTo-Lnwu. WASHINGI'DN, D c

JOHN M. BEECH, F MARSHALLTOWN, IOWA.

DAMPER-REGULATING MECHANISM.

Specification of Letters Patent.

Patented Feb. 9, 1215.

Application filed February 21, 1911, Serial No. 610,403. Renewed July 13, 1914. Serial No. 850,803.

To all whom it may, concern:

Be it known that 1, JOHN M. Bnnon, citizen of the United States of America, and resident of Marshalltown, Marshall county, Iowa, have invented a new and useful Damper-Regulating Mechanism, of which the following is a specification.

The object of this invention is to provide improved means for controlling the heat given off by a hot-air furnace through the regulation of dampers by expansion. and contraction of the furnace.

A further object of this invention is to provide means for manual control of the furnace dampers auxiliary to the automatic control thereof by expansion and contraction of the furnace.

A further object. of this invention is to provide means for adjusting the range or throw of damper-regulating mechanism so as to regulate the degree to which either damper may be opened in a given movement of the regulator. 1

My invention consists in the construction, arrangement and combination of elements hereinafter set forth, pointed out in my claims and illustrated by the accompanying drawing, in which- Figure 1 is an elevation, partly in section, illustrating the application of my improved mechanism to a furnace. Fig. 2 is a View similar to Fig. lshowing a modified construction of the regulating mechanism. Fig. 3 is an elevation, on an enlarged scale, of a part of the mechanism shown in Fig.2. Fig. 4 is a bottom view of the devices shown in Fig. 3. Fig. 5 is a further enlarged end elevation of the devices shown in Figs. 3 and 4:. Fig. 6 is a front elevation and Fig. 7 a side elevation of adjusting means employed in the apparatus.

In the construction and application of the devices as shown the numeral 10 designates a furnace, 11 a casing, 12 a draft damper or door, and 13 a check damper or door, all of which may be of any desired construction and are here illustrated conventionally, neither of these elements forming any part of my invention.

A frame 14 is mounted over the furnace and preferably is secured by means of integral cars 15, fastened by screws to a support 16, which may be a joist of the floor above. The frame 14 is formed with an oblique arm 17 on one end portion, which arm terminates in a hook 18. A bell-crank lever 19 is journaled on a bolt 20 extending transversely of the hook 18. One arm of the bell-crank lever 19 is formed with a weight 21 on its extremity and a bolt 22 is mounted trans versely in and centrally of said'weight and extends therefrom at one end. The weight also is formed with a laterally projecting lug or stop 23 on its upper end. The frame 14 is formed with a vertical arm 24 depending from its end portion opposite the oblique arm 17; and said vertical arm terminates in a fork 25. A lever 26 is fulcrumed at one end on a bolt 27 mounted transversely of the fork of the arm 24. The opposite end of the lever 26 is formed with a fork 28 adapted to embrace the weight 21 on the bellcrank lever 19; andsaid fork 28 has its arms bifurcated and adapted to embrace the bolt 22. One ofthe bifurcated arms of the fork 28 has an obliquely arranged prong or extremity 29. A socket 30 is pivoted to and depends from the lever 26 adjacent to the fork 25 and a rod 31, preferably made of gas pipe, is screwed into the socket 30 and depends therefrom loosely through the top of the casing 11 to a position of rest on the crown of the furnace 10. A draft device 32, such as a chain, wire or cable, is fixed at one end to the extremity of the upper arm of the bell-crank lever 19 and extends therefrom over one or more direction pulleys 33 to a point of attachment to the check damper 13, and normally is taut. A draft device 34, such as a chain, wire or cable, is fixed at one end to the extremity of the upper arm of the bell-crank lever 19 and extends therefrom through one or more direction pulleys 35. If desired, the draft device 34 may be continued directly to a point of attachment to the draft damper 12.

It is to be understood that the draft damper 12 is in open position when the check damper 13 is in closed position, and vice versa. I prefer, however, to extend the draft device 34 through a pulley block 36 and thence through the floor to a point of adjustable connection with a regulator plate in the room above. The regulator plate in the room above is not shown but may be of any desired form such as is well known for the purpose of receiving attachment of the upper end portion of the draft device and suspending the same at any desired altitude. By thismeans the pulley block 36 is suspended in a bight of the draft device. The pulley block 36 supports a hook 37, which hook in turn supports a double hook 38. An adjusting plate 39 is pivmedian line.

oted at one end on and supported by the double hook 38 and is formed with a series of holes 40 in a vertical row along its The adjusting plate 39 is formed with an car 41 on its lower end and said ear is vertically apert'ured. An adjusting rod 42 is mounted loosely through the car 41 and is formed with a hook 43 on its upper end, which hook is adapted to engage in one or another of the holes 40. The adjusti'ng rod 42 is formed with a hook 44 on its lower end'adapted to support a draft device 45, such as a chain, wire or cable; and the oppositeend of said draft device 45 is attached to the draft damper 12. Through theuse of the adjusting plate 39 and adjusting rod 42 the effective length of the draft devices between the bell-crank lever 19 and draft damper 12 may be increased or diminished by changing the location of the hook '43 in respect of the holes 40. Thus is provision made for changing. the range of operation or throw of the dampers 12, 13.

In Fig. 1 I have illustrated the range or throw of the dampers at the maximum of effectiveness; namely, when the check damper 13 is closed the draft damper 12 is open to admit the full capacity of the draft opening and when the draft damper 12 is closed the check damper 13 is open to its full capacity. By manually lowering the adjusting rod 42 so that the hook 43 thereof would engage in a lower hole 40, the relation of one damper to the other would be changed so that when one damper is closed the other damper would be open to a lesser degree, even to the extent, by using the lowermost hole 40, of providing a very slight range or throw of the dampers. By extending the draft device 34 from the pulley block 36 to the room above, provision is made for manually opening or closing either damper or closing both dampers by manip ulation of the upper end portion of said draft device. This operation is auxiliary to the automatic operation and would be used only in an emergency, depending on the temperature of the room or rooms being served by the furnace and the amount of [fuel and conditions of burning thereof in the furnace.

In the practical operation of this device the parts are adjusted as shown in Fig. 1 when the furnace is cool and new or replenished fire has been prepared and it is desired to increase the temperature of the furnace and the supply of heated air and the temperature thereof given off by the furnace to the rooms being served. To this end the draft damper 12 is opened and the check damper '13 is closed. The increasing fire developed under the conditions just described expands the crown 10 of the furnace and causes said crown in expanding to act through the rod 31 and socket 30 and raise the lever 26. The range of expansion of the furnace in ordinary use is approximately one-sixteenth inch and hence the range of movement of the rod and socket is approximately the same. Upward movci'ncnt of the lever 26 is communicated through the bolt 22 to an oscillation of the bell-crank lever 19 which causes said bell-crank lever to act on the draft devices 32 and 34 and close the damper 12 and open the damper 13. This movement of oscillation of the bellcrank lever 19 is in opposition to the weight 21 and requires lifting said weight, thus providing that the weight counterbalances the damper 12 and returns the bellcrank lever and the lever 26 to normal positions when the lifting force of the expanding furnace on the rod 31 is relaxed by contraction of the furnace.

In a general way the construction illustrated in Figs. 2, 3, 4 and 5 is like that illustrated in Fig. 1, 6 and 7 but certain modifications or differences of construction are illustrated, as follows: The bell-crank lever 19 is formed with a housing or keeper 19 and a bolt 46 is mounted transx 'erscly thereof. A. pulley 47 is fixed to the bolt 46 within the housing or keeper 19 and the draft devices 32, 34 are combined as one draft device 34, which is extended around said pulley and secured thereto at the lowermost point of the pulley in normal position.

The draft device 34 extends in opposlte directions from the pulley 47 to points of attachment to the dampers or to one damper and the adjusting devices. An arm 48 is fixed at one end to the bolt 46 and extends obliquely parallel with the upper arm of the bell-crank 19 and a weight 49 is fixed to the extremity of said arm. An eye 50 is formed on the weight 49 and a draft device 51, such as a chain, wire or cable, is attached at one end to said eye, extends through one or more direction pulleys 52 and thence through the floor to the room above where it is adapted for engagement by the regulator plate above mentioned (not shown). It is the function of the weighted arm 48 to tend to turn the pulley 47 in one direction and to afford resistance by gravity to manual pull on the draft device 51.

In the practical use of this device the bellcrank lever is oscillated in one direction by gravity and in the opposite direction by upward thrust of the rod 31, and either movement is communicated through the pulley 47 to a longitudinal movement of the draft device 34 and consequent relative movements of the dampers 12,13 in opposite directions. Auxiliary to such movement of the bellcrank lever, pulley and draft device 34 through the expansion or contraction of the furnace, there is provision for manual adjustment of the dampers such as by a pull on the draft device 51 which raises the weight 49 and arm 48 and moves the pulley 47 and bolt 46 rotatively. Such rotative movement of the pulley is communicated to the draft device 34 to the end of opening the damper 12 and closing the damper 13. Such movement can be set to adjust the dampers to either position by engagement of the draft device 51 with the regulator plate (not shown) and when released and relaxed the weight49 will return the arm 48, bolt 46 and pulley 47 to normal positions and cause a reverse movement of the draft device 34: to the end of closing the damper 12 and opening the damper 13. This latter movement is dependent, however, on the position of the bell-crank lever 19" in respect of its control by the rod 31 and furnace. Movement of the bell-crank lever in one direction is limited by engagement of the lug or stop 23 with the lever 26.

It sometimes occurs that the furnace contracts to such extent that the bolt 22 entirely leaves the slot.in the arm of the yoke 28 and to prevent such parts assuming inoperative positions the inclined prong or finger 29 is provided, which prong or finger would under such circumstances remain beneath and in engagement with thebolt and guide such bolt again into the slot when the lever 26 is raised.

I claim as my invention- 1. A damper-regulating mechanism, comprising a frame formed with arms at its 0pposite ends, a weighted bell-crank lever fulcrumed to one arm of the frame, draft devices attached to one arm of said bell-crank lever and adapted for respective attachment to draft and check dampers, an actuating lever fulcrumed to the opposite arm of said frame and slidingly engaging the weighted arm of the bell-crank lever, and an actuating rod forked and pivoted at its forked end to the actuating lever adjacent the fulcrum thereof and depending into contact with a furnace, said rod being adapted to be moved rectilinearly to lift said lever by expansion of said furnace.

2. In a damper-regulating mechanism, a frame, a weighted bell-crank lever fulcrumed thereon, one arm of said bellcrank lever extending obliquely upwardly and the other arm thereof extending obliquely downwardly, draft devices leading from the upwardly extending arm of said bell-crank lever, an actuating lever fulcrumed at one end on said frame and slidingly engaging at its opposite end with the downwardly extending arm of the bellcrank lever and adapted to move the weighted arm of the bell-crank lever through an arc, and an actuating rod pivoted to the actuating lever adjacent the fulcrum thereof and depending therefrom, said actuating rod adapted to contact with a furnace.

3. In a damper-regulating mechanism, a frame, a weighted bell-crank lever fulcrumed thereon, one arm of said bell-crank lever extending obliquely upwardly and the other arm thereof extending obliquely downwardly, draft devices leading from the upwardly extending arm of said bellcrank lever, an actuating lever fulcrumed at one end on said frame and forked at its opposite end, said forked end of the actuating lever having sliding connections with the downwardly extending arm of the bellcrank lever, a sto limiting downward movement of the Weighted arm of said bellcrank lever, and an actuating rod pivoted to the actuating lever adjacent the fulcrum thereof and depending therefrom, said actuating rod adapted to contact with a furnace.

4. In a damper-regulating mechanism, a bell-crank lever formed with a weight at the extremity of one arm, a bolt mounted through the weighted arm of the lever, draft devices attached to the unweighted arm of the lever, an actuating lever of the third class, means for oscillating the actuating lever, said actuating lever formed with a vertical fork embracing the weighted arm of the bell-crank lever, both arms of said fork being slotted horizontally for sliding and pivotal engagement with said bolt, and a stop in the weighted arm of said bell-crank lever adapted to engage the upper surface of said actuating lever.

Signed by me at Des Moines, Iowa, this thirtieth. day of January, 1911.

JOHN M. BEECH.

Witnesses:

S. 0. SWEET, EARL M. SINCLAIR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

